NEET BIOLOGY

Detailed explanation-1: -Plants require mostly blue and red light for photosynthesis, but for flowering, infrared light is also needed. Incandescent lights produce mostly red and some infrared light, but very little blue light. Fluorescent lights vary according to the amount of phosphorus used by the manufacturer.

Detailed explanation-2: -While red is most efficient for photosynthesis, having only red light would result in poor growth such as very elongated stems, so blue is added to keep plants compact and a more typical shape.

Detailed explanation-3: -Red light is necessary for seed germination, root growing. 600-700 nm wavelength range red light is used to support the development of a plant and improving the taste of fruit. Blue light provides chlorophyll production (the most active pigment for photosynthesis) in plants.

Detailed explanation-4: -Red light is highly effective at regulating growth and development for plants. Red light helps to flower and fruit and prolong flowering. It can greatly enhance the photosynthesis of plants and promote the growth of plants.

Detailed explanation-5: -Generally, blue light suppresses extension growth; plants grown with blue light are usually shorter and have smaller, thicker and darker green leaves compared to plants grown without blue light (Figure 1).